Hideyuki Yamashiro

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Lipid contents and compositions of the bleached Okinawan corals were analyzed for the first time. Bleached corals collected at Sesoko Okinawa, Japan (26°38′N, 127°52′E), after the 1998 bleaching event showed decreased lipid content with a concomitant decline of wax in the lipid composition. The reductionin the lipid content of corals showed diversity(More)
Reef-building corals contain large amounts of storage lipids, which range from 9 to 47% of the dry weight of their tissues (Harland et al. 1993; Yamashiro et al. 1999). These lipids are mainly derived from carbon photosynthetically fixed by symbiotic zooxanthellae (Kelogg and Patton 1983; Harland et al. 1993). Lipid levels in coral tissue appeared to vary(More)
Growth anomalies (GAs), one of the diseases recently reported for scleractinian corals, are characterized by an abnormal skeletal structure and reduced zooxanthella density. The pathological characteristics of GAs were studied in colonies of Porites australiensis on a reef in Kayo, Okinawa, Japan. Corallites in the GA region lost the skeletal architecture(More)
Light and transmission electron microscopy were used to study mechanisms involved in the separation of the disc from the stalk in juvenileFungia fungites (Scleractinia, Fungiidae). Separation occurs because the skeleton is weakened by dissolution across a distinct plane at the junction of the stalk and disc. The tissue layer adjacent to the skeleton in the(More)
A short-term, localized outbreak of diatoms attached to live corals was observed along the coast of Sesoko Island, Okinawa, Japan in February, 2011. Diatoms are recognized as brown patches in the initial stage, becoming fluffy encrustations and resulting in complete or partial coral death. Attached diatoms, including Licmophora, Climacosphenia, Ardissonea(More)
The solitary, free-living coralDiaseris distorta (Michelin) (Fungiidae, Scleractinia) reproduces asexually by fragmentation along radially oriented slits. Localized skeletal dissolution, which can be recognized as white, opaque and chalky lines along the thecal wall between segments, ultimately results in autotomy. We suggest that the skeletal dissolution(More)
This study describes new symptoms for Turbinaria in the temperate region of Japan, where coral reefs do not develop (Fig. 1a). Focal bleaching was observed on colonies of Turbinaria peltata (Esper), which is dominant around the study site on Ohshima Island (31 31¢ N, 131 24¢ E) located to the east of the main island of Kyushu, Japan. The bleached spots,(More)